Australian Water Information Dictionary

Water status: Design rainfalls

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ANCOLD

Australian National Committee on Large Dams

This definition applies to:

annual exceedance probability (AEP)

The probability that a given rainfall total accumulated over a given duration will be exceeded in any one year.

Related: average recurrence interval (ARI)

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ARR

Australian rainfall and runoff

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average recurrence interval (ARI)

The average or expected value of the periods between exceedances of a given rainfall total accumulated over a given duration. It is implicit in this definition that the periods between exceedances are generally random.

Related: annual exceedance probability (AEP)

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CDIRS

computerised design IFD rainfall system

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generalised short-duration method (GSDM)

Appropriate for estimating probable maximum precipitation for durations up to six hours and for an area of less than 1000 square kilometres.

Related: probable maximum precipitation (PMP)

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generalised southeast Australia method (GSAM)

Appropriate for estimating probable maximum precipitation in regions of Australia where tropical storms are not the source of the greatest rainfall depths and where topographic influences vary markedly.

Related: probable maximum precipitation (PMP)

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generalised tropical storm method – revised (GTSMR)

Appropriate for estimating probable maximum precipitation in regions of Australia affected by tropical storms.

Related: probable maximum precipitation (PMP)

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IFD

intensity-frequency-duration

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PMF

probable maximum flood

Related: probable maximum precipitation (PMP)

This definition applies to:

probable maximum precipitation (PMP)

The greatest depth of precipitation for a given duration meteorologically possible for a given size storm area at a particular location at a particular time of the year, with no allowance made for long-term climatic trends.

Source: World Meteorological Organisation (1986). Manual for Estimation of Probable Maximum Precipitation. Second Edition. Operational Hydrology Report No. 1, WMO – No. 332, Geneva.

This definition applies to: